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2. Ein neues Messverfahren zur bestimmung des Elastizitätsmoduls und der Dämpfung;Förster;Z. Metallkd.,1937
3. A method for determining mechanical resonance frequencies and for calculating elastic moduli from these frequencies;Spinner,1961
4. The frequency of longitudinal and torsional vibrations of unloaded and loaded bars;Davis;Phil. Mag.,1938
5. Elastic Constants and Their Measurement;Schreiber,1973